Petrous portion of the internal carotid artery
Name = Petrous portion of the internal carotid artery
Latin = pars petrosa arteriae carotidis internae
GraySubject = 146
GrayPage = 567
Caption = Auditory tube, laid open by a cut in its long axis.
internal carotid artery
caroticotympanic arteries, vidian artery
DorlandsPre = p_07
DorlandsSuf = 12617502
Petrous portion of the
internal carotid artery(or petrous segment).—When the internal carotid artery enters the canal in the petrous portionof the temporal bone, it first ascends a short distance, then curves forward and medialward, and again ascends as it leaves the canal to enter the cavity of the skull between the lingulaand petrosal processof the sphenoid.
The artery lies at first in front of the
cochleaand tympanic cavity; from the latter cavity it is separated by a thin, bony lamella, which is cribriformin the young subject, and often partly absorbed in old age.
Farther forward it is separated from the
semilunar ganglionby a thin plate of bone, which forms the floor of the fossa for the ganglionand the roof of the horizontal portion of the canal.
Frequently this bony plate is more or less deficient, and then the ganglion is separated from the artery by fibrous membrane.
The artery is separated from the bony wall of the
carotid canalby a prolongation of dura mater, and is surrounded by a number of small veins and by filaments of the carotid plexus, derived from the ascending branch of the superior cervical ganglionof the sympathetic trunk.
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